Pen loop



FIG. 1 is a front perspective view of my design;

FIG. 2 is a right side elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a front elevational view;

FIG. 5 is a rear elevational view;

FIG. 6 is a top plan view;

FIG. 7 is a bottom plan view; and,

FIG. 8 is a bottom plan view. The broken lines showing a pen in FIG. 8 are included for the purpose of illustrating environmental matter and form no part of the claimed design.

The broken lines on the edges of the pen loop in FIGS. 1 and 4 to 8 represent stitching and form a part of the claimed design. 

The ornamental design for a pen loop, as shown and described. 